forking vs fibrillation

forking and fibrillation both are nouns.

Word	Noun	Adjective	Verb	Adverb
forking	Yes	No	No	No
fibrillation	Yes	No	No	No

As nouns, fibrillation is a hyponym of forking; that is, fibrillation is a word with a more specific, narrower meaning than forking:

Other hyponyms of forking include bifurcation, trifurcation, divarication.

forking (noun)	fibrillation (noun)
the act of branching out or dividing into branches	act or process of forming fibrils
the place where something divides into branches	muscular twitching involving individual muscle fibers acting without coordination